Can you add CineFrom support? It is Open Source now and GoPro users will be very will be grateful for it.
Se here:
https://github.com/gopro/cineform-sdk
https://gopro.com/en/us/news/gopro-open-sources-the-cineform-codec
Do you speak about decoder only or about encoder at well?
The latter would be possible once the bundled FFmpeg gets upgraded to the not yet released version 4.4, but it doesn't make much sense in Avidemux as its internal pixel format is just YV12 (yuv420p with U and V planes swapped). YV12 greatly reduces the benefits from CineForm HD decode support as well.